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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of States in which Entity Operates 10       10    
Provision for Doubtful Accounts         $ 1,524,000 $ 1,895,000 $ 2,539,000
Allowance for Doubtful Accounts Receivable, Ending Balance $ 4,610,000       $ 4,610,000 5,041,000  
Number of Reportable Segments         2    
Contract with Customer, Refund Liability, Total 8,078,000       $ 8,078,000 8,827,000  
Continuing Care Retirement Communities, Refund Obligation 2,172,000       2,172,000 2,887,000  
Equity Securities, FV-NI, Unrealized Gain (Loss), Total $ 721,000 $ 3,486,000 $ 12,448,000 $ (15,517,000) 1,138,000
Accounting Standards Update 2016-01 [Member]              
Reclassification of Net Unrealized Gains From AOCI To Retained Earnings         68,073,000    
Accounting Standards Update 2018-02 [Member]              
Reclassification of Stranded Tax Effects From AOCI to Retained Earnings         $ 128,000    
Refundable Advance Fees [Member]              
Nonrefundable Resident Entry Fee Percentage         10.00%    
Original Entry Fee [Member]              
Refundable Resident Entry Fee Percentage         90.00%    
Appreciation [Member]              
Appreciation of Apartment Over Original Residents Entry Fee Percentage         40.00%    
Building and Building Improvements [Member] | Minimum [Member]              
Property, Plant and Equipment, Useful Life         20 years    
Building and Building Improvements [Member] | Maximum [Member]              
Property, Plant and Equipment, Useful Life         40 years    
Equipment and Furniture [Member] | Minimum [Member]              
Property, Plant and Equipment, Useful Life         3 years    
Equipment and Furniture [Member] | Maximum [Member]              
Property, Plant and Equipment, Useful Life         15 years    
Corporate Office Costs [Member]              
General and Administrative Expense, Total         $ 28,700,000 $ 29,800,000 $ 28,800,000
Caris [Member]              
Equity Method Investment, Ownership Percentage 75.10%       75.10%